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Chinese Physics B, Volume. 29, Issue 8, (2020)

Negative thermal expansion of Ca2RuO4 with oxygen vacancies

Sen Xu1, Yangming Hu1, Yuan Liang2、†, Chenfei Shi3, Yuling Su3, Juan Guo1, Qilong Gao1, Mingju Chao1, and Erjun Liang1
Author Affiliations
  • 1Key Laboratory of Materials Physics of Education of China, School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 45000, China
  • 2Department of Applied Physics, Donghua University, Shanghai 0160, China
  • 3School of Physics and Electronic Engineering, Zhengzhou University of Light Industry, Zhengzhou 450001, China
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    (a) XPS analysis for the Ru 4d orbitals of the samples prepared with O2/Ar ratios of 0.5%, 1.0%, 1.5%, and 2.0% and in ambient atmosphere conditions, red: Ru+5, yellow: Ru+4, green: Ru+3. (b)–(d) Rietveld analysis of the SXRD patterns for (b) Ca2RO3.87, (c) Ca2RO3.73 and (d) Ca2RO4.09.

    Fig. 1. (a) XPS analysis for the Ru 4d orbitals of the samples prepared with O2/Ar ratios of 0.5%, 1.0%, 1.5%, and 2.0% and in ambient atmosphere conditions, red: Ru+5, yellow: Ru+4, green: Ru+3. (b)–(d) Rietveld analysis of the SXRD patterns for (b) Ca2RO3.87, (c) Ca2RO3.73 and (d) Ca2RO4.09.

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    Thermal expansion property: (a) relative length change of ceramic cylinders measured by dilatometry; (b)–(e) changes of lattice constants, lattice volume, and (f) the Ca–Ru distance for (b) Ca2RuO4.09, (c) Ca2RuO3.87, and (d) Ca2RuO3.73 with temperature. The insert shows the octahedron rotation about the c-axis and tilt about an axis in the Ru–O(1) plane.

    Fig. 2. Thermal expansion property: (a) relative length change of ceramic cylinders measured by dilatometry; (b)–(e) changes of lattice constants, lattice volume, and (f) the Ca–Ru distance for (b) Ca2RuO4.09, (c) Ca2RuO3.87, and (d) Ca2RuO3.73 with temperature. The insert shows the octahedron rotation about the c-axis and tilt about an axis in the Ru–O(1) plane.

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    (a)–(c) Temperature dependent changes of (a) orthorhombic strain, (b)–(d) Ru–O(1) bond lengths in (010) and (100) directions, and Ru–O(2) bond length of Ca2RuO4.09, Ca2RuO3.87, and Ca2RuO3.73, (f) RuO6 octahedra.

    Fig. 3. (a)–(c) Temperature dependent changes of (a) orthorhombic strain, (b)–(d) Ru–O(1) bond lengths in (010) and (100) directions, and Ru–O(2) bond length of Ca2RuO4.09, Ca2RuO3.87, and Ca2RuO3.73, (f) RuO6 octahedra.

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    (a) Temperature dependence of (a) resistivity and (b) the field-cooled and zero-field-cooled susceptibility of Ca2RuO3.87, Ca2RuO3.73, and Ca2RuO4.09. Insertion: the magnetization curves at T = 10 K.

    Fig. 4. (a) Temperature dependence of (a) resistivity and (b) the field-cooled and zero-field-cooled susceptibility of Ca2RuO3.87, Ca2RuO3.73, and Ca2RuO4.09. Insertion: the magnetization curves at T = 10 K.

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    • Table 1. Coefficients of axial and lattice volume expansion.

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      Table 1. Coefficients of axial and lattice volume expansion.

      SamplesTemperatureαa/(ppm/K)αb/(ppm/K)αc/(ppm/K)αv/(ppm/K)
      Ca2RuO4.09100 K–500 K9.08.15.022.3
      Ca2RuO3.87100 K–350 K−15.9−151.4144.0−38.6
      350 K–500 K−5.0−3.554.613.8
      Ca2RuO3.73100 K–350 K−18.2−151.4145.9−39.8
      350 K–500 K0.05−3.250.019.0
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    Sen Xu, Yangming Hu, Yuan Liang, Chenfei Shi, Yuling Su, Juan Guo, Qilong Gao, Mingju Chao, Erjun Liang. Negative thermal expansion of Ca2RuO4 with oxygen vacancies[J]. Chinese Physics B, 2020, 29(8):

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    Paper Information

    Received: Mar. 19, 2020

    Accepted: --

    Published Online: Apr. 29, 2021

    The Author Email: Liang Yuan (ejliang@zzu.edu.cn)

    DOI:10.1088/1674-1056/ab8a36

    Topics

    Nuclear physics
    Particles and fields
    Particle and nuclear astrophysics and cosmology